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Hydrogeologic conditions, the river boundary and the distance from wells, indicate that there <br />should be no significant effect on local groundwater users due to the mining on the Lafarge <br />Brown property. If Lafarge receives a complaint from a well owner, Lafarge will initiate an <br />evaluation of the cause and notify the DBMS within two weeks. <br />After the DRMS has been notified, Lafarge will review the available data and information and <br />submit a report to the DRMS within 30 days. To the extent practicable, the report will identify <br />the extent of potential or actual impacts associated with the changes. The evaluation will include <br />discussions with any well owner who has contacted Lafarge regarding a concern and review of <br />available data from the well and vicinity to evaluate the cause of any changes (e.g., seasonal <br />variations, climate, mining by Lafarge, mining by others, or other factors). Lafarge would also <br />enlist the service of a contract professional hydrogeologic consultant to provide an opinion and <br />meet with the Division to discuss the findings. If the claim cannot be resolved with this <br />information, Lafarge would fund the service of a 3rd party consultant agreeable to the Division to <br />render a separate opinion. If Lafarge's mining or reclamation activities are determined to be a <br />significant contributing factor that has or may create adverse impacts, the mining-associated <br />impacts will be addressed to the satisfaction of the DRMS. <br />An initial temporary mitigation measure (for cases in which Lafarge's operation is a suspected <br />cause) may entail providing an alternative water supply that meets the documented historic well <br />production, or need, until further investigation can be conducted to determine if the well <br />condition is due to Lafarge's mining operation. If, after review, the DRMS determines that the <br />impact on a well, for which temporary mitigation has been initiated, is not a result of Lafarge's <br />activities, or is not solely a result of Lafarge's activities, then Lafarge shall reduce or cease <br />mitigation accordingly with the approval of the DRMS. Lafarge has no responsibility to provide <br />mitigation for wells that are constructed after the permit is approved. <br />Mitigation measures, divided into temporary and long term, may include, but are not limited to: <br />Temporary: <br />• Compensation for well owner to use their existing treated water system to replace the <br />well production loss; <br />• Provide a water tank and deliver water as necessary to meet documented historic well <br />production or need; <br />• Other means acceptable to both the well owner and Lafarge. <br />Long-Term: <br />• Cleaning a well to improve efficiency. <br />• Providing an alternative source of water or purchasing additional water to support historic <br />well use in terms of water quantity and quality. If needed, water quality parameters will <br />be checked in affected wells to ensure alternative sources support the historic use. <br />• Modifying a well. to operate under lower groundwater conditions. This could include <br />deepening existing wells or lowering the pumps. All work would be done at Lafarge's <br />Greeley 35' Avenue Mine (M-1977-036) <br />DRMS 112 Reclamation Permit Amendment Application <br />Groundwater Monitoring and Mitigation Plan <br />Page 4